After the United Airlines vs. Dr. Dao incident back in April, the Chicago-based carrier has been making a lot of policy changes. United’s newest potential solution to solving overbooked flights? Introducing the so-called “Flex-Schedule Program." United partnered with startup technology company, Volantio, to create a new method for managing overbooked flights. The Flex-Schedule Program starts as an opt-in option upon booking on United.com and will not be available on third party booking sites. If a flight is getting close to…